Si Racha was once just a seafront fishing town full of rickety wooden piers which has had some serious development, mainly due to the Japanese car factories nearby. Although it’s developing, the old piers are still there and fishermen still go about their traditional way of life. The town is popular with Bangkokians at weekends but is very quiet in the week, so a good stopover if you want to experience a non-touristy relaxed Thai fishing town.
The town has no beach and no sights, so is understandably not high on the tourism radar.
Si Racha has a good few Japanese restaurants and Japanese style bars as well as boasting some tasty seafood places. There is an impeccably well maintained Health Park on the seafront complete with a nice café. On an evening it is full of residents jogging, practising tai chi and following aerobics classes. From here you can take a 40-minute boat to the once royal beach retreat of Ko Si Chang.
A day is long enough to get the feel of Si Racha and see pretty much all there is to see.